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Acoustic wave elements, antenna duplexers and electronic devices

a technology of antenna duplexer and idt electrode, applied in the direction of basic electric elements, impedence networks, electric devices, etc., can solve the problems of spurious signal and manufacturing difficulties, and achieve the effect of suppressing spurious rayleigh wave signal, reducing the thickness of idt electrode, and improving frequency characteristi

Active Publication Date: 2016-09-15
SKYWORKS PANASONIC FILTER SOLUTIONS JAPAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention allows for a thinner IDT electrode and the suppression of a spurious Rayleigh wave signal. This improves the frequency characteristic and makes the device smaller.

Problems solved by technology

Such an increased thickness of the IDT electrode would lead to processing limitations in lithography and other processes and cause difficulties in manufacturing.
Such a smaller cut angle would cause a spurious signal due to a Rayleigh wave.

Method used

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  • Acoustic wave elements, antenna duplexers and electronic devices
  • Acoustic wave elements, antenna duplexers and electronic devices
  • Acoustic wave elements, antenna duplexers and electronic devices

Examples

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Embodiment Construction

[0031]Aspects and embodiments of acoustic wave elements are described below with reference to the accompanying drawings. It is to be appreciated that embodiments of the methods and apparatuses discussed herein are not limited in application to the details of construction and the arrangement of components set forth in the following description or illustrated in the accompanying drawings. The methods and apparatuses are capable of implementation in other embodiments and of being practiced or of being carried out in various ways. Examples of specific implementations are provided herein for illustrative purposes only and are not intended to be limiting. Also, the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use herein of “including,”“comprising,”“having,”“containing,”“involving,” and variations thereof is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. References ...

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Abstract

An acoustic wave element comprising a lithium tantalate substrate having the Euler angles (φ, θ, ψ), a first component φ satisfying 10°≦φ≦50°; and an electrode disposed on the lithium tantalate substrate and configured to excite a main acoustic wave of wavelength λ, the electrode having a density ρM satisfying ρM≧ρTi where ρTi represents a density of titanium (Ti), and a thickness hM of the electrode satisfies 0.141×exp(0.075ρM)λ≦hM≦0.134λ Embodiments of the present disclosure minimize a thickness of the electrode and suppress a spurious Rayleigh wave signal.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application Ser. No. 62 / 132,046, titled “ACOUSTIC WAVE ELEMENTS, ANTENNA DUPLEXERS AND ELECTRONIC DEVICES,” filed on Mar. 12, 2015, which is hereby incorporated herein by reference in its entirety.TECHNICAL FIELD[0002]Aspects and embodiments of the present disclosure generally relate to an acoustic wave element, an antenna duplexer or a diplexer including the acoustic wave element, and an electronic device including the acoustic wave element, the antenna duplexer, or the diplexer.BACKGROUND[0003]Conventionally, an acoustic wave element in which non-leaky shear horizontal (SH) waves propagate along a lithium tantalate (LiTaO3) substrate has been used as a filter and an antenna duplexer for a mobile communication device and the like. In such an acoustic wave element, the SH waves are excited by configuring the velocities of the SH waves to be less than those...

Claims

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Application Information

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IPC IPC(8): H03H9/25
CPCH03H9/25H03H9/0222H03H9/02559H03H9/14538H03H9/6433H03H9/02834H03H9/6496H03H9/725H01P1/20H01P1/205H01P1/213
Inventor KOMATSU, TOMOYASHIMIZU, HIDEHITOFUJIWARA, JOJITSURUNARI, TETSUYANAKAMURA, HIROYUKI
Owner SKYWORKS PANASONIC FILTER SOLUTIONS JAPAN
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